Aluminum isn’t found free in nature, owing to its always ____ with other elements, most commonly with oxygen.


  1. A.
    being combined
  2. B.
    having combined
  3. C.
    combine
  4. D.
    combined
A
試題分析：combine …with…與……結(jié)合；這里owing to中的to是介詞，故它的后面應(yīng)跟動(dòng)名詞，這里是its+動(dòng)名詞也就是動(dòng)名詞的復(fù)合結(jié)構(gòu)。又因?yàn)閕ts與combine之間是被動(dòng)關(guān)系，故用being combined。句意：在自然界中發(fā)現(xiàn)的鋁不是自己存在的，因?yàn)殇X和其它元素結(jié)合在一起，通常情況下是和氧在一起。故選A。
考點(diǎn)：考查非謂語動(dòng)詞的用法。
點(diǎn)評(píng)：本題較難。不容置疑，高考將繼續(xù)加強(qiáng)對(duì)非謂語動(dòng)詞的考查，試題的特征將繼續(xù)呈現(xiàn)出“情景化”和“設(shè)問角度的多樣化”的趨勢(shì)，但試題的難度將會(huì)有所控制。
即學(xué)即練：______from other continents for millions of years， Australia has many plants and animals not found in any other country in the world．
　A． Being separated         B． Having separated
C． Having been separated  D． To be separated
解析：C。
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[　　]

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